Which of the following statements about the Jurassic Period is true? Select one:

Question

Which of the following statements about the Jurassic Period is true?

Select one:

a. Sea levels rose and submerged 30% of Earth’s current land surface.

b. The first mammals evolved from mammal-like reptiles.

c. Mammals flourished on land as major players in the ecosystem.

d. It is named for the Jura Sea.

e. Dinosaurs were the dominant animal form on land.

Question 2

The Mesozoic Era 250 million years ago was characterized by the breakup of _______ and the birth of __________.

Select one:

a. Euramerica; Burgess Shale

b. Euramerica; Pangaea

c. Pangaea; the Mid-Atlantic Ridge

d. Pangaea; Gondwana

e. Gondwana; land animals

Question 3

Which statement about mass extinctions is not true?

Select one:

a. Not all mass extinctions occur for the same reason.

b. Mass extinctions wipe out hundreds, even thousands, of dominant species.

c. Mass extinctions have played a crucial role in determining the character of the flora and fauna that are present on the planet today.

d. All are true.

e. Because of their destructive nature, mass extinctions tend to eliminate ecological niches, making it more difficult for other species to live, grow, and reproduce in the new environments.

Question 4

What characteristic marks the beginning of the Cambrian Period of the Paleozoic Era, 540 million years ago?

Select one:

a. an "explosion" of complex forms of life with shells and hard external body parts

b. insects such as cockroaches and reptiles

c. the first land animals

d. corals and clams

e. jawless fishes with thick bony armored plates

Question 5

What is thought to have caused the Triassic/Jurassic extinction?

Select one:

a. flooding and huge precipitation events

b. an episode of global cooling that brought on an Ice Age

c. extreme weather patterns

d. massive floods of lava erupting from the central Atlantic seafloor

e. all of these

Question 6

What are cratons?

Select one:

a. a byproduct of photosynthesis

b. domelike structures formed by microscopic bacteria that trapped sediment between themselves

c. cores of extremely ancient rock around which continents built themselves

d. craters that formed when asteroids and comets collided with Earth’s surface and released noxious gases

e. ancient rocks that are found on the Moon

Question 7

Which statement about the Ordovician Period is not true?

Select one:

a. When shallow seas covering much of North America receded, they left behind thick limestone units.

b. Most of the world’s land was collected into the southern supercontinent known as Gondwana.

c. During the Ordovician Period, the area north of the tropics was almost entirely ocean.

d. Jawless fishes with thick bony, armored plates appeared.

e. Almost all of the marine invertebrate survived the mass extinction at the end of the Ordovician Period.

Question 8

Which of the following event pairs both occurred around the same time (geologically speaking)?

Select one:

a. First land plants / first flowers

b. First birds / dinosaurs dominate

c. First homo sapiens / dinosaurs go extinct

d. Mammals dominate / trilobites

e. First fishes / first reptiles

Question 9

If you place a coffee cup in a puddle of mud and come back to find no cup, but instead the impression of the outside of the cup, what is the geologic term for the type of fossil that has formed?

Select one:

a. carbonization

b. cast

c. mold

d. replacement/permineralization

e. sample

Question 10

Which major event in the Archaen led to the possibility of life as we understand it on Earth?

Select one:

a. First primitive mammals

b. Cooling of the Earth's surface

c. First plants on land

d. Differentiation of the Earth leading to an iron core and development of magnetic field

e. Oxygenation of the atmosphere

Question 11

Which of the following did not occur in the Jurassic Period?

Select one:

a. The Tethys Sea wrapped around the globe at the equator.

b. Plate subduction along western North America caused the crust to fold, creating mountains in the western part of the continent.

c. Reptiles adapted to the sea, land, and air.

d. Mammals played a minor role in the ecosystem.

e. All of these occurred during the Jurassic Period.

Question 12

Which order of geologic time units goes from most brief unit to longest unit?

Select one:

a. eons, periods, eras, epochs

b. eras, periods, eons, epochs

c. epochs, eras, eons, periods

d. eons, eras, epochs, periods

e. epochs, periods, eras, eons

Question 13

Which order of eras is correct, from oldest to most recent?

Select one:

a. Mesozoic, Cenozoic, Paleozoic

b. Paleozoic, Cenozoic, Mesozoic

c. Cenozoic, Mesozoic, Paleozoic

d. Mesozoic, Paleozoic, Cenozoic

e. Paleozoic, Mesozoic, Cenozoic

Question 14

What are stromatolites?

Select one:

a. domelike structures formed by microscopic bacteria that trapped sediment between themselves

b. a byproduct of photosynthesis

c. ancient rocks that are found on the Moon

d. cores of extremely ancient rock around which continents built themselves

e. craters that formed when asteroids and comets collided with Earth’s surface and released noxious gases

Question 15

Which extinction event is known as The Great Dying?

Select one:

a. End Mesozoic

b. End Permian

c. Silurian-Devonian

d. Triassic-Jurassic

e. End Ice Age

Explanation / Answer

Which of the following statements about the Jurassic Period is true?

answer: option e. Dinosaurs were the dominant animal form on land.

explanation:-

The jurassic was the golden age for large herbivore dinosaurs known as the sauropods-Camarasaurus, Apatosaurs, Diplodocus, Brachiosaurus and many other that roamed the land late in the period.

** according to cheeg policy only one question can be answered in a single post, please post the remaining questions again for further answers***

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